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Companies are increasingly being held accountable for the life‐cycle impact of their products and services. Transportation is frequently a major component of this life‐cycle impact. Hence, to reduce total environmental impact, logistics managers will have to become more sophisticated in their understanding of how they can reduce the environmental impact of their transportation operations, without negatively affecting the cost or effectiveness of these operations. In line with this mandate, we quantify the dynamic impact of road vehicles on the environment. In most emission models, a constant speed is used depending only on the specific road type. Using such a model will lead to an underestimation of the effective emissions. It turns out that the differences with a more realistic dynamic assessment model are significant. The analysis here suggests that the policy consequences of these differences for both public sector managers and private companies are potentially quite important. 相似文献
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MASJA VAN MEETEREN 《全球网;跨国事务杂志》2012,12(3):314-332
The literature on immigrant transnationalism and on irregular immigration suggests irregular migrants engage relatively little in transnational activities because of the obstacles associated with their legal and economic statuses. Drawing on participant observation and in‐depth interviews with a diverse population of irregular migrants in Belgium and the Netherlands, however, I shall demonstrate in this article that irregular migrants do indeed engage in various transnational activities. Moreover, I argue that a focus on aspirations helps to understand why irregular migrants either do or do not engage in specific transnational activities. Distinguishing between investment, settlement and legalization aspirations, I analyse whether and for what reasons irregular migrants carry out economic, social and political transnational activities. I conclude that future research on transnationalism and on the incorporation of irregular and regular migrants alike could benefit from contextualizing the agency of migrants by taking their aspirations into account. 相似文献
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Abstract In this article we question a central trope of transnationalism and new media – deterritorialization – and its application to border crossing Internet usage by Iranian and Turkish‐Kurdish migrants in the Netherlands. Their Internet usage indicates the extent to which territoriality channels these groups' online practice. We found Dutch‐Iranian sites reflected correspondingly sparse offline community networks and state boundaries moulded their transnational ties, while regionally specific transnational dynamics were evident in Turkish‐Kurdish website surfing. These cases indicate that transnationalism and new media need not broaden or dissolve geographical identity or connectivity, but may reinforce it. Finally, we address the relations of territoriality with generation (first and second) and network medium (web forums versus conventional sites). Whereas first‐generation migrants' life online often reveals extensions of offline networks, the online practice of the second generation frequently reflects these networks in subtler ways, forming partially sovereign online communities that pivot on hyphenated identities. However, the relations of generation and network medium differ for Turkish Kurds and Iranians in the Netherlands. 相似文献